石炭ガス化燃料中のアンモニア除去に関する研究
1995 年 61 巻 592 号 p. 4483-4491
詳細
1995 年 61 巻 592 号 p. 4483-4491
In integrated coal gasification combined cycle power generation (IGCC) systems, ammonia in the gasified fuel is passed through a hot/dry gas cleanup facility into the gas turbine. The ammonia is converted to nitrogen oxides in the combustion process in the gas turbine. Therefore ammonia removal from coal-gasified fuel would effectively reduce NOx emissions in IGCC systems. We're defined the optimum NO/NH3 ratio, the optimum concentration of added O2 and the influence of CO and H2 in the coal-gasified fuel on NH3 decomposition and NO reduction by experiments using a tubular flow reactor and numerical analysis based on reaction kinetics. The main results are as follows : (1) The optimum NO/NH3 ratio is about 1 to maximize NH3 decomposition and NO reduction. (2) The NH3 decomposition ratio depends only on H2, and decreases rapidly with increasing H2 concentration. (3) The NO reduction ratio decreases with increasing H2 concentration. (4) This method is effective for decreasing TFN by up to 60% minimizing the total concentration of remaining NH3 and NO in air-blown coal-gasified fuel.
